Oxford Companion to Shakespeare.- This link opens in a new window
Edited by Michael Dobson, Stanley Wells , Will Sharpe, and Erin Sullivan.
Oxford: Oxford University Press, 2015.
Along with the regular A-Z entries, the Oxford Companion to Shakespeare includes a chronology, a guide to further reading, a thematic contents list, and entries on each of Shakespeare's works. This online edition, revised in 2011, contains updates to more than 200 entries, along with 16 new ones.